Herbicide and application thereof

Abstract

The invention belongs to the technical field of pesticide weeding, and discloses a herbicide and application thereof.The herbicide comprises an active ingredient A and an active ingredient B. The active ingredient A is isoxamid or ester thereof, the active ingredient B is any one of haloxyfop-R-methyl, quizalofop-p-ethyl or fluazifop-p-butyl, and the active ingredient B is one of haloxyfop-R-methyl, quizalofop-p-ethyl and fluazifop-p-butyl. The mass ratio of the active component A to the active component B is (1: 15)-(24: 1). The herbicide provided by the invention can effectively prevent and treat weeds in various crop fields, can effectively enhance the prevention and treatment effect of a single agent, has no adverse effect on crop growth, and is good in safety.

Description

Technical Field

[0001] The present invention belongs to the technical field of pesticide weeding, and discloses a herbicide and its application. Background Art

[0002] Weeds, as an integral part of the agricultural ecosystem, grow rapidly in farmland. They not only compete with crops for water and nutrients but also serve as intermediate hosts for various pests and diseases. If not controlled in time, they will spread and affect the growth of crops. According to investigations, there are about 580 common weeds in 77 families in Chinese farmland, among which 427 are dryland weeds, accounting for 74%. The wide variety of weeds brings many difficulties to weed control work.

[0003] Weeds are the great enemies of crop growth. They not only compete for water and light, but more importantly, for nutritional fertilizers, and they are also the media for spreading pests and diseases, seriously affecting the growth and development of crops. Chemical weeding is quick-acting and effective, can effectively kill weeds, and is safe for crops.

[0004] The compound use of herbicides has the characteristics of expanding the herbicidal spectrum, enhancing herbicidal activity, and slowing down the emergence of weed resistance, and is a common weeding method in agricultural production activities. Summary of the Invention

[0005] The purpose of the present invention is to provide a herbicide with reasonable components, obvious synergistic effect, which can effectively kill various weeds and is safe for crops.

[0006] Another purpose of the present invention is to provide a herbicide preparation.

[0007] Another purpose of the present invention is to provide an application for controlling unwanted plants in crop fields.

[0008] In order to achieve the above purposes, the present invention adopts the following technical solution: a herbicide, the herbicide contains active ingredient A and active ingredient B, the active ingredient A is isoxaben and its salts or esters, and the active ingredient B is any one of haloxyfop-P-methyl, quizalofop-P-ethyl or fluazifop-P-butyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:15 to 24:1;

[0009] Further, the active ingredient A is isoxaben or isoxaben methyl ester;

[0010] Further, the active ingredient B is haloxyfop-P-methyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:6 to 12:1;

[0011] The active ingredient B is quizalofop-P-ethyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:4 to 12:1;

[0012] The active ingredient B is fluazifop-p-butyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:12 to 4:1.

[0013] Furthermore, the active ingredient B is haloxyfop-R-methyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:6 to 8:1;

[0014] The active ingredient B is quizalofop-p-ethyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:4 to 8:1;

[0015] The active ingredient B is fluazifop-p-butyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:9 to 4:1;

[0016] Furthermore, taking the total weight of the herbicide as 100 wt%, the active ingredient accounts for 0.5% to 70% of the total weight of the herbicide;

[0017] Furthermore, the herbicide contains active ingredients and auxiliary ingredients, and is prepared into a preparation dosage form suitable for agricultural use.

[0018] Furthermore, the preparation dosage form is a solid preparation or a liquid preparation.

[0019] Furthermore, the solid preparation is a water dispersible granule, and the liquid preparation is an emulsifiable concentrate, a dispersible oil suspension, a microemulsion, a suspension concentrate or an oil-in-water emulsion.

[0020] The present invention also discloses the application of the herbicide as described above in controlling unwanted plants in crop fields.

[0021] Furthermore, the crops are rape, soybean, cotton, peanut, and cabbage.

[0022] Furthermore, the plants are gramineous weeds, and the gramineous weeds are wild oats, barnyard grass, green foxtail, golden foxtail, crabgrass, wild millet, goosegrass, Alopecurus aequalis, Eragrostis pilosa, Leptochloa chinensis, Bromus japonicus, Hordeum, Lolium multiflorum, Lolium temulentum, Panicum miliaceum, Poa annua, Paspalum distichum, Cynodon dactylon, Imperata cylindrica, Agropyron repens, Phragmites australis, rigid grass, Brachiaria.

[0023] The beneficial effects of the present invention are as follows:

[0024] The herbicide of the present invention has reasonable components, remarkable herbicidal synergistic effect, can delay the generation and development of target weed resistance, has no adverse effect on crop growth, and has good safety; while reducing the dosage of pesticides, it reduces production costs and alleviates the pressure of pesticides on the environment; the herbicide of the present invention has good control effect on weeds in dryland crops such as rape, soybean, cotton, peanut, and cabbage. Detailed implementation mode

[0025] In order to make the objectives, technical solutions and advantages of the present invention more concise and clear, the present invention is illustrated by the following specific embodiments, but the present invention is by no means limited to these embodiments. The following described embodiments are only preferred embodiments of the present invention and can be used to describe the present invention, and should not be construed as a limitation on the scope of the present invention. It should be noted that any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0026] Formulation Preparation Examples The preparation methods are as follows:

[0027] 1. Preparation method of water dispersible granules: According to the formulation ratio, add the active ingredient to the carrier, and add a surfactant and other functional auxiliaries thereto, mix, add 10-25% of water after air flow pulverization, and then obtain the water dispersible granule product through kneading, granulation, drying and screening; or spray water, granulate and dry the pulverized powder in a fluidized bed granulator, and then screen to obtain the water dispersible granule product.

[0028] 2. Preparation method of wettable powder: According to the formulation ratio, mix the active ingredient, dispersant, wetting agent and filler, and uniformly stir in a stirring kettle, and perform multiple pulverizations and mix uniformly by an air flow pulverizer to obtain the wettable powder product.

[0029] 3. Preparation method of emulsifiable concentrate: According to the formulation ratio, add the metered active ingredient, solvent and cosolvent to a blending kettle and stir to dissolve it, then add an emulsifier, make up the balance with the remaining solvent, stir evenly in the stirring kettle, and filter to obtain the emulsifiable concentrate product.

[0030] 4. Preparation method of dispersible oil suspension: According to the formulation ratio, place the active ingredient, surfactant and other functional auxiliaries in a reaction kettle in sequence, add oil and mix evenly, perform high-speed shearing and wet grinding, and finally homogenize and filter to obtain the dispersible oil suspension product.

[0031] 5. Preparation method of microemulsion: According to the formulation ratio, mix the active ingredient, solvent, emulsifier, etc. to obtain the oil phase, mix the antifreeze agent and water evenly to obtain the water phase, add the oil phase to the water phase under stirring and stir evenly, continue to shear for 10 min, and then add an antifoaming agent and stir evenly to obtain small droplets with an oil phase particle size of 0.01-0.1 microns, that is, obtain the microemulsion product.

[0032] 6. Preparation method of suspension: According to the formulation ratio, place the active ingredient, surfactant and other functional auxiliaries in a reaction kettle in sequence, add water and mix evenly, perform high-speed shearing and wet grinding, and finally homogenize and filter to obtain the suspension product.

[0033] 7. Preparation method of the aqueous emulsion: According to the formula ratio, dissolve the active ingredient in the solvent, add the emulsifier to form a homogeneous oil phase, mix deionized water, antifreeze agent, etc. together to form a homogeneous aqueous phase; under high-speed shearing, add the oil phase to the aqueous phase, shear until the particle size is qualified, then add the defoaming agent, thickening agent, and preservative and stir evenly to form a well-dispersed aqueous emulsion product.

[0034] The following are the formula compositions of the preparation examples of the preparations:

[0035] Preparation Example 1: 33% isoxaben · haloxyfop-P-methyl dispersible oil suspension concentrate (2:1)

[0036] Formula composition: 22% isoxaben, 11% haloxyfop-P-methyl, 2% lignosulfonate, 3% styrylphenol polyoxyethylene ether, 15% castor oil polyoxyethylene ether, 2% calcium dodecylbenzenesulfonate, 1% silicon dioxide, soybean oil to make up the balance.

[0037] Preparation Example 2: 20% isoxaben · haloxyfop-P-methyl microemulsion (4:1)

[0038] Formula composition: 16% isoxaben, 4% haloxyfop-P-methyl, 20% cyclohexanone, 15% triphenylethylphenol polyoxyethylene ether, 5% alkyl glycoside, 5% isopropanol, 1% styrylphenol polyoxyethylene ether sulfate, 0.1% silicone defoaming agent, deionized water to make up the balance.

[0039] Preparation Example 3: 15% methyl isoxaben · haloxyfop-P-methyl emulsifiable concentrate (1:1)

[0040] Formula composition: 7.5% methyl isoxaben, 7.5% haloxyfop-P-methyl, 18% DMF, 12% sorbitan polyoxyethylene ether, 2% calcium dodecylbenzenesulfonate, 18% propylene carbonate, trimethylbenzene to make up the balance.

[0041] Preparation Example 4: 9% methyl isoxaben · haloxyfop-P-methyl aqueous emulsion (8:1)

[0042] Formula composition: 8% methyl isoxaben, 1% haloxyfop-P-methyl, 8% xylene, 12% cyclohexanone, 1% BHT, 2% castor oil polyoxyethylene ether phosphate, 3% ethylene oxide - propylene oxide copolymer, 4% ethylene glycol, 0.05% silicone defoaming agent, 0.1% xanthan gum, 0.1% potassium benzoate, deionized water to make up the balance.

[0043] Preparation Example 5: 30% isoxaben · quizalofop-P-ethyl suspension concentrate (4:1)

[0044] Formulation composition: 24% isoxaben, 6% quizalofop-p-ethyl, 2% ethylene glycol oxyethylene polyoxypropylene ether, 2% glycerol fatty acid ester polyoxyethylene ether, 2% triphenylvinylphenol ethoxylate phosphate, 1% succinate sulfonate, 1% magnesium aluminum silicate, 0.1% carboxyethyl cellulose, 1% sodium sorbate, 5% glycerol, 0.5% silicone oil, deionized water to make up the balance.

[0045] Preparation Example 6: 24% Isoxaben · Quizalofop-p-ethyl Water Dispersible Granules (2:1)

[0046] Formulation composition: 16% isoxaben, 8% quizalofop-p-ethyl, 10% sodium lignosulfonate, 2% Nekal BX, 2% alkyl polyoxyethylene ether sulfonate, kaolin to make up the balance.

[0047] Preparation Example 7: 12% Methyl Isoxaben · Quizalofop-p-ethyl Microemulsion (1:2)

[0048] Formulation composition: 4% methyl isoxaben, 8% quizalofop-p-ethyl, 12% mesitylene, 20% cyclohexanone, 10% polyoxyethylene sorbitan, 5% EO-PO block copolymer, 1% calcium dodecylbenzenesulfonate, 5% ethylene glycol, 0.05% silicone defoamer, 0.1% Kathon, deionized water to make up the balance.

[0049] Preparation Example 8: 18% Methyl Isoxaben · Quizalofop-p-ethyl EC (1:1)

[0050] Formulation composition: 9% methyl isoxaben, 9% quizalofop-p-ethyl, 17% N-methylpyrrolidone, 12% polyoxyethylene ether of Guerbet alcohol, 2% calcium dodecylbenzenesulfonate, 12% DMF, methyl oleate to make up the balance.

[0051] Preparation Example 9: 4% Isoxaben · Fluazifop-p-butyl EW (1:3)

[0052] Formulation composition: 1% isoxaben, 3% fluazifop-p-butyl, 4% polyoxyethylene sorbitan oleate, 1% aryl phenol polyoxyethylene ether phosphate, 12% cyclohexanone, 0.1% xanthan gum, 5% ethylene glycol, 1% urea, 0.3% sodium sorbate, 0.05% silicone defoamer, deionized water to make up the balance.

[0053] Preparation Example 10: 15% Isoxaben · Fluazifop-p-butyl OD (2:3)

[0054] Formulation composition: 6% isoxaben, 9% fluazifop-p-butyl, 2% alkyl polyoxyethylene ether sulfonate, 15% polyoxyethylene castor oil, 2% fatty alcohol polyoxyethylene ether, 3% calcium dodecylbenzenesulfonate, 0.5% silica, 0.5% organobentonite, soybean oil to make up the balance.

[0055] Preparation Example 11: 11% Methyloxadiazon·Haloxyfop-P-methyl EC (8:3)

[0056] Formulation composition: 8% Methyloxadiazon, 3% Haloxyfop-P-methyl, 12% Dimethyl sulfoxide, 10% Isotridecyl alcohol polyoxyethylene ether, 2% Calcium dodecylbenzenesulfonate, 20% Propylene carbonate, and xylene to make up the balance.

[0057] Preparation Example 12: 7% Methyloxadiazon·Haloxyfop-P-methyl Microemulsion (4:3)

[0058] Formulation composition: 4% Methyloxadiazon, 3% Haloxyfop-P-methyl, 20% Cyclohexanone, 10% Phenethylphenol polyoxyethylene polyoxypropylene ether, 2% Alkylphenol formaldehyde resin polyoxyethylene ether, 1% Fatty alcohol polyoxyethylene ether sulfate, 5% Triphenylvinylphenol polyoxyethylene ether, 0.02% Organosilicon defoamer, and deionized water to make up the balance.

[0059] Example 1: Determination of the combined action of mixed pesticides

[0060] The test was carried out with reference to the determination of the combined action of mixed formulations in the "Guidelines for Indoor Bioassay Tests of Pesticides" (NY / T 1155.7 - 2006).

[0061] The test weeds were Avena fatua, Echinochloa crusgalli, Setaria viridis, Panicum miliaceum, Sclerochloa dura, Brachiaria eruciformis. Take a number of mature and plump seeds from the previous year and set aside.

[0062] Cultivation conditions: The test was carried out in an artificial intelligence climate chamber. Select a number of plastic pots with a diameter of 25 cm, add an appropriate amount of moist sterilized loam so that the soil surface diameter is 20 cm, the temperature is 20 - 25 °C, the relative humidity is 60% - 80%, the light - dark cycle is 14 h - 10 h, the light intensity is 2000 lx, the culture medium is sieved air - dried loam, the organic matter content is 1.6%, and the pH value is 6.7. The soil was completely moistened by the bottom seepage irrigation method of the pot. The pretreated test weed seeds were evenly sown on the soil surface, covered with 1 cm of soil, and then transferred to the greenhouse for conventional cultivation. The bottom seepage irrigation method of the pot was used to replenish water to keep the soil moist.

[0063] Test pesticides: Oxadiazon, Methyloxadiazon, Haloxyfop - P - methyl, Quizalofop - P - ethyl or Haloxyfop - P - methyl technical material.

[0064] Pesticide preparation: The technical material was dissolved in a suitable solvent, and then diluted with a 0.1% aqueous solution of Tween 80.

[0065] Chemical treatment: Thin out the seedlings and determine the number of plants per hill after the weeds emerge, ensuring a consistent weed density. Select test materials with appropriate leaf ages for spraying treatment. Calibrate the spray volume before the experiment and spray in the order from low dose to high dose according to the experimental design. Each treatment has 4 replicates, and a treatment of spraying a 0.1% Tween 80 aqueous solution containing the corresponding organic solvent is set as a blank control. After treatment, wait for the liquid on the surface of the test materials to dry naturally and transfer them to the greenhouse for conventional cultivation.

[0066] Investigation: Regularly observe and record the growth status of the test weeds after treatment. At 21 days after treatment, harvest the above-ground weeds and weigh their fresh weights.

[0067] Use the Gowing method to calculate the theoretical fresh weight inhibition rate E0 of each chemical after the mixed treatment.

[0068] Fresh weight control efficacy E = (fresh weight in the control area - fresh weight in the treatment area) × 100 / fresh weight in the control area

[0069] Theoretical control efficacy of the mixture E0 = weed control efficacy when the dosage of herbicide A is P + weed control efficacy when the dosage of herbicide B is Q - weed control efficacy when the dosage of herbicide A is P × weed control efficacy when the dosage of herbicide B is Q ÷ 100

[0070] Evaluation criteria for the combined action of the mixed chemicals:

[0071] When E - E0 > 10%, it is a synergistic effect; when E - E0 < -10%, it is an antagonistic effect; when E - E0 is between ±10%, it is an additive effect.

[0072] The results of the indoor combined action determination test are shown in the following table:

[0073] Table 1 Results of the indoor bioactivity test of the mixture of isoxaben and haloxyfop - P - methyl against Echinochloa crusgalli

[0074]

[0075] It can be seen from Table 1 that the E - E0 values of different mixed combinations of isoxaben and haloxyfop - P - methyl against Echinochloa crusgalli are all higher than -10%, showing an additive or synergistic effect. When the mixing mass ratio of isoxaben and haloxyfop - P - methyl is 1:6 - 12:1, E - E0 > 10%, showing a synergistic effect on Echinochloa crusgalli; among them, when isoxaben and haloxyfop - P - methyl are mixed at a mass ratio of 20:5, that is, 4:1, the synergistic effect on the weed Echinochloa crusgalli is the most significant.

[0076] Table 2 Results of the indoor bioactivity test of the mixture of isoxaben and quizalofop - P - ethyl against Sclerochloa kengiana

[0077]

[0078]

[0079] As can be seen from Table 2, the E-E0 values of different combinations of isoxaben and quizalofop-p-ethyl against rigid ryegrass are all higher than -10%, showing additive or synergistic effects. When the mass ratio of isoxaben to quizalofop-p-ethyl in the mixture is 1:6, 1:8 to 12:1, E-E0 > 10%, showing synergistic effects on rigid ryegrass; among them, when isoxaben and quizalofop-p-ethyl are mixed at a mass ratio of 20:10, that is, 2:1, the synergistic effect on the weed rigid ryegrass is the most significant.

[0080] Table 3 Indoor bioassay results of the mixture of isoxaben and fluazifop-p-butyl against Brachiaria eruciformis

[0081]

[0082]

[0083] As can be seen from Table 3, the E-E0 values of different combinations of isoxaben and fluazifop-p-butyl against Brachiaria eruciformis are all higher than -10%, showing additive or synergistic effects. When the mass ratio of isoxaben to fluazifop-p-butyl in the mixture is 1:12 to 4:1, E-E0 > 10%, showing synergistic effects on Brachiaria eruciformis; among them, when isoxaben and fluazifop-p-butyl are mixed at a mass ratio of 20:30, that is, 2:3, the synergistic effect on the weed Brachiaria eruciformis is the most significant.

[0084] Table 4 Indoor bioassay results of the mixture of methyl isoxaben and haloxyfop-r-methyl against wild oats

[0085]

[0086] As can be seen from Table 4, the E-E0 values of different combinations of methyl isoxaben and haloxyfop-r-methyl against wild oats are all higher than -10%, showing additive or synergistic effects. When the mass ratio of methyl isoxaben to haloxyfop-r-methyl in the mixture is 1:6 to 24:1, E-E0 > 10%, showing synergistic effects on wild oats; among them, when methyl isoxaben and haloxyfop-r-methyl are mixed at a mass ratio of 20:5, that is, 4:1, the synergistic effect on the weed wild oats is the most significant.

[0087] Table 5 Indoor bioassay results of the mixture of methyl isoxaben and quizalofop-p-ethyl against green foxtail

[0088]

[0089]

[0090] As can be seen from Table 5, the E-E0 values of different combinations of metazachlor methyl ester and quizalofop-p-ethyl against Setaria viridis are all higher than -10%, showing additive or synergistic effects. When the mass ratio of metazachlor methyl ester to quizalofop-p-ethyl in the mixture is 1:6, 1:4 to 8:1, E-E0 > 10%, showing synergistic effects against Setaria viridis; among them, when metazachlor methyl ester and quizalofop-p-ethyl are mixed at a mass ratio of 10:10, that is, 1:1, the synergistic effect on the weed Setaria viridis is the most significant.

[0091] Table 6 Results of indoor bioactivity test on Echinochloa crusgalli of the mixture of metazachlor methyl ester and fluazifop-p-butyl

[0092]

[0093] As can be seen from Table 6, the E-E0 values of different combinations of metazachlor methyl ester and fluazifop-p-butyl against Echinochloa crusgalli are all higher than -10%, showing additive or synergistic effects. When the mass ratio of metazachlor methyl ester to fluazifop-p-butyl in the mixture is 1:12 to 4:1, E-E0 > 10%, showing synergistic effects against Echinochloa crusgalli; among them, when metazachlor methyl ester and fluazifop-p-butyl are mixed at a mass ratio of 40:30, that is, 4:3, the synergistic effect on the weed Echinochloa crusgalli is the most significant.

[0094] Example 2: Field herbicidal efficacy test in rapeseed fields

[0095] Test site: The test was carried out in Pu'an Village, Jiangxia District, Wuhan City. The test site was flat, with convenient drainage and irrigation, clay soil, and medium to high fertility.

[0096] Test crop: Rapeseed (Zhongyou 12).

[0097] Test target: Gramineous weeds in rapeseed fields.

[0098] Test design: The test was set with 7 chemical treatments and a blank control, each treatment was repeated 4 times, and the area of each plot was 20 m 2 . Spray evenly on the weeds between the rows of rapeseed with a 3WJD-18 knapsack electrostatic sprayer. When applying the medicine, the rapeseed was at the 5-6 leaf stage and the weeds were at the 3-7 leaf stage.

[0099] Efficacy investigation: Field investigation was carried out 30 days and 60 days after application. Two points were investigated in each plot, and each point was 0.25 m 2 . Record the number of weed plants 30 days and 60 days after application. Add the fresh weight control effect (measure the fresh weight of the above-ground weeds) 60 days after application, and calculate the herbicidal effect of the medicine.

[0100] Efficacy calculation formula:

[0101]

[0102] Investigation of rapeseed economic traits: Yield measurement was carried out when the rapeseed was mature and harvested.

[0103] Table 7 Results of Field Herbicidal Efficacy Trials for Controlling Weeds in Rapeseed Fields

[0104]

[0105] As can be seen from Table 7, 30 days after application, the highest control efficacy was achieved with Preparation Example 2: 20% isoxaben · haloxyfop-P-methyl microemulsion (4:1) at 30 g / hm2, with a plant control efficacy of 87.52%. For the control efficacy against weeds 60 days after application, the highest control efficacy was also achieved with Preparation Example 2: 20% isoxaben · haloxyfop-P-methyl microemulsion (4:1) at 30 g / hm2, with a plant control efficacy of 95.37% and a fresh weight control efficacy of 96.10%. Secondly, the control efficacy of Preparation Example 5: 30% isoxaben · quizalofop-P-ethyl suspension concentrate (4:1) at 40 g / hm2 was also relatively high, with a plant control efficacy of 92.07% and a fresh weight control efficacy of 94.10%. In terms of rapeseed yield, the yield of the herbicide-treated plots was higher than that of the control plots, with an increase in yield of 2.25% - 16.61%. Among them, the yield of Preparation Example 2: 20% isoxaben · haloxyfop-P-methyl microemulsion (4:1) at 30 mL / ha was the highest, reaching 121.54 kg / 667m 2 , with a 16.61% increase in yield compared to the control treatment, and the increase was significant. Thus, it can be seen that applying the herbicide of the present invention can effectively inhibit the growth of field weeds, promote the growth and development of rapeseed, and result in a higher yield.

[0106] Example 3: Field Herbicidal Efficacy Trials for Controlling Weeds in Soybean Fields

[0107] Test site: The test site was located in a soybean field in Taiping Village, Hulin City, Heilongjiang Province. The soil of the test plot was black soil with medium to above-average soil fertility. The main gramineous weeds in the test plot included barnyardgrass, green foxtail, and crabgrass.

[0108] Test design: 7 chemical treatments were set up in the test, and a blank control was also set. The field plots were arranged in a randomized block design, with each treatment replicated 4 times, and the area of each plot was 28m 2 .

[0109] Application method: The test was conducted when the soybeans were in the 2 - 3 trifoliate leaf stage and the annual weeds were in the 3 - 5 leaf stage. A 3WBS-16 intelligent electric sprayer from Taizhou, Zhejiang was used to spray fine mist on the weeds in a directional manner, and no other herbicides were used during the test period.

[0110] Weed investigation: 5 random points were taken from each plot 20 days after treatment, with each point being 0.25m 2 , to investigate the growth situation of soybeans and the plant control efficacy. The fresh weight control efficacy of weeds was investigated 45 days after treatment. The control efficacy of the tested chemicals against annual weeds in soybean fields was evaluated by combining the plant control efficacy and the fresh weight control efficacy, and the yield was measured at harvest.

[0111] Pharmacodynamic calculation formula:

[0112]

[0113] Table 8 Results of Field Herbicidal Efficacy Trials for Controlling Weeds in Soybean Fields

[0114]

[0115] Through irregular observations after application of the herbicide, no phytotoxicity symptoms were found in each treatment of the herbicide of the present invention, indicating that the test agent of this test is safe for the growth of soybeans at the test dose. The investigation was carried out 20 days after application. Preparation Example 3: 15% S-metolachlor methyl ester · haloxyfop-R-methyl EC (1:1), Preparation Example 12: 7% S-metolachlor methyl ester · quizalofop-P-ethyl microemulsion (4:3), Preparation Example 7: 12% S-metolachlor methyl ester · quizalofop microemulsion (1:2) had plant control effects on weeds of 83.12%, 88.23%, and 85.89% respectively. 45 days after application, the control effect of Preparation Example 12: 7% S-metolachlor methyl ester · quizalofop-P-ethyl microemulsion (4:3) was the highest, with a plant control effect of 93.93% and a fresh weight control effect of 95.56%. Through field yield measurement, Preparation Example 3: 15% S-metolachlor methyl ester · haloxyfop-R-methyl EC (1:1), Preparation Example 12: 7% S-metolachlor methyl ester · quizalofop-P-ethyl microemulsion (4:3), Preparation Example 7: 12% S-metolachlor methyl ester · quizalofop microemulsion (1:2) increased the yield by 18.51%, 24.72%, and 20.69% respectively compared with the blank control.

[0116] The above embodiments are only to illustrate the technical concept and characteristics of the present invention, and the purpose is to enable those of ordinary skill in the art to understand the content of the present invention and implement it accordingly, and it should not be used to limit the protection scope of the present invention. Any change or modification of one or more effects made according to the essence of the content of the present invention should be covered within the protection scope of the present invention.

Claims

1. A herbicide, characterized in that, The herbicide described above contains active ingredient A and active ingredient B. The active ingredient A is isoxaben and its salts or esters, and the active ingredient B is any one of haloxyfop-P-methyl, quizalofop-P-ethyl or fluazifop-P-butyl. The mass ratio of the active ingredient A to the active ingredient B is 1:15 to 24:

1.

2. The herbicide according to claim 1, wherein, The active ingredient A is isoxaben or methyl isoxaben, the active ingredient B is haloxyfop-P-methyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:6 to 12:1; The active ingredient B is quizalofop-P-ethyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:4 to 12:1; The active ingredient B is fluazifop-P-butyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:12 to 4:

1.

3. The herbicide according to claim 2, wherein The active ingredient B is haloxyfop-P-methyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:6 to 8:1; The active ingredient B is quizalofop-P-ethyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:4 to 8:1; The active ingredient B is fluazifop-P-butyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:9 to 4:

1.

4. The herbicide according to claim 1, characterized in that, Taking the total weight of the herbicide as 100 wt%, the active ingredients account for 0.5% to 70% of the total weight of the herbicide.

5. The herbicide according to claim 1, characterized in that, The herbicide described above contains active ingredients and auxiliary ingredients, and is prepared into a preparation dosage form suitable for agricultural use.

6. The herbicide according to claim 5, characterized in that, The preparation dosage form is a solid preparation or a liquid preparation.

7. The herbicide according to claim 6, characterized in that The solid preparation is a water dispersible granule, and the liquid preparation is an emulsifiable concentrate, a dispersible oil suspension, a microemulsion, a suspension concentrate or an emulsion in water.

8. Use of the herbicide according to claims 1-7 for controlling unwanted plants in crop fields.

9. The application according to claim 8, characterized in that, The crops are rape, soybean, cotton, peanut, and cabbage.

10. The application according to claim 8, wherein, The plants are gramineous weeds, and the gramineous weeds are Avena fatua, Echinochloa crusgalli, Setaria viridis, Setaria glauca, Digitaria sanguinalis, Panicum dichotomiflorum, Eleusine indica, Alopecurus aequalis, Eragrostis pilosa, Leptochloa chinensis, Bromus japonicus, Hordeum, Lolium multiflorum, Lolium temulentum, Panicum miliaceum, Poa annua, Paspalum distichum, Cynodon dactylon, Imperata cylindrica, Agropyron repens, Phragmites australis, Sclerochloa dura, Brachiaria eruciformis.

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